20562823 has 2 divisors, whose sum is σ = 20562824. Its totient is φ = 20562822.

The previous prime is 20562811. The next prime is 20562833. The reversal of 20562823 is 32826502.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20562823 - 2¹³ = 20554631 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20562791 and 20562800.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20562803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10281411 + 10281412.

It is an arithmetic number, because the mean of its divisors is an integer number (10281412).

Almost surely, 2^20562823 is an apocalyptic number.

20562823 is a deficient number, since it is larger than the sum of its proper divisors (1).

20562823 is an equidigital number, since it uses as much as digits as its factorization.

20562823 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5760, while the sum is 28.

The square root of 20562823 is about 4534.6249017973. The cubic root of 20562823 is about 273.9644713910.

The spelling of 20562823 in words is "twenty million, five hundred sixty-two thousand, eight hundred twenty-three".